// Protocol Buffers for GWT
// Copyright 2010 Thomas Broyer All rights reserved.
// http://code.google.com/p/protobuf-gwt/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package net.ltgt.gwt.protobuf.compiler;

import com.google.protobuf.Descriptors.MethodDescriptor;
import com.google.protobuf.Descriptors.ServiceDescriptor;
import com.google.protobuf.compiler.JavaHelpers;

import net.ltgt.gwt.protobuf.compiler.GwtOptionsProtos.GwtServiceOptions;
import net.ltgt.gwt.protobuf.compiler.client.Generator;

import java.io.IOException;
import java.io.Writer;

/**
 * @author t.broyer@ltgt.net Thomas Broyer
 * Based on the initial work of:
 * @author kenton@google.com Kenton Varda
 * Based on original Protocol Buffers design by
 * Sanjay Ghemawat, Jeff Dean, and others.
 */
public abstract class AbstractServiceGenerator extends Generator {

  protected final ServiceDescriptor descriptor;

  public AbstractServiceGenerator(ServiceDescriptor descriptor) {
    super(descriptor.getName());
    this.descriptor = descriptor;
  }

  @Override
  public void generate(Writer output) throws IOException {
    GwtServiceOptions options = descriptor.getOptions().getExtension(
        GwtOptionsProtos.serviceOptions);
    if (options.hasRemoteServiceRelativePath()) {
      output.write("@com.google.gwt.user.client.rpc.RemoteServiceRelativePath(\"");
      output.write(options.getRemoteServiceRelativePath());
      output.write("\")\n");
    }

    output.write("public interface " + descriptor.getName() + "\n");
    output.write("    extends com.google.gwt.user.client.rpc.RemoteService {\n");
    // indent

    generateDescriptor(output);

    for (MethodDescriptor method : descriptor.getMethods()) {
      generateMethod(method, output);
    }

    // outdent
    output.write("}\n");
  }

  protected abstract void generateDescriptor(Writer output) throws IOException;

  private void generateMethod(MethodDescriptor method, Writer output)
      throws IOException {
    output.write(JavaHelpers.getClassName(method.getOutputType()) + " "
        + method.getName() + "("
        + JavaHelpers.getClassName(method.getInputType()) + " request);\n");
  }
}